Dragon, Obsidian Mature Adult (CR 17)

Huge Dragon (Fire)
Alignment: Always neutral evil
Initiative: +0; Senses: blindsense 60 ft., darkvision120 ft., low-light vision, and keen senses
Languages: Draconic

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AC: 32 (-2 size, +24 natural), touch 8, flat-footed 32
Hit Dice: 25d12+125 (287 hp); DR: 10/magic
Fort +19, Ref +14, Will +16

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Speed: 40 ft., fly 150 ft. (poor), burrow 20 ft., swim 20 ft.
Space: 15 ft./10 ft. (15 ft. with bite)
Base Attack +25; Grapple +42
Attack: 1 bite +32, 2 claws +27, 2 wings +27, 1 tail slap +27, 1 crush +27
Damage: 1 bite 2d8+9, 2 claws 2d6+4, 2 wings 1d8, 1 tail slap 2d6, 1 crush 2d8
Special Attacks/Actions: Breath weapon 14d10 (27)

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Abilities: Str 29, Dex 10, Con 21, Int 27, Wis 15, Cha 14
Special Qualities: Fire subtype, planar travel, Firefall, Biofeedback, burning ray, Whitefire, wall of ectoplasm, SR 26, Fear aura (DC 24), Manifester level 9
Feats: #Feats: 9
Skills: Skill points: 206
Advancement: 26-27 HD (Huge)

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Climate/Terrain: Inner Planes, warm mountains, underground
Organization: Solitary (1 dragon, any age), clutch (1d4+1 wyrmlings, very young, young, juvenile, or young adults), family (pair of mature adults and 1d4+1 offspring)
Treasure/Possessions: Double standard

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Source: Web

Fire Subtype (Ex): An obsidian dragon is immune to fire but takes double damage from cold, except on a successful save.

Breath Weapon (Su): An obsidian dragon has one breath weapon: a cone of fire.

Planar Travel (Su): Obsidian dragons have the innate ability to pass instantly between the Material Plane and the Inner Planes, where they often make their homes.

Psionics (Sp): 3/day -- biofeedback, burning ray, ectoplasmic armor, firefall, flaming shroud, plane shift, wall of ectoplasm, whitefire; 1/day -- genesis, mind store. Manifester level varies by age; save DC d20 + appropriate ability modifier + power level.

Attack/Defense Modes: mind thrust/thought shield. An obsidian dragon manifests powers and gains additional attack and defense modes as if it were a psion with Metacreativity as its primary discipline.

Skills: An obsidian dragon has the Appraise skill for free at 1 rank per Hit Die.

Fire Subtype

A creature with the fire subtype has immunity to fire. It has vulnerability to cold, which means it takes half again as much (+50%) damage as normal from cold, regardless of whether a saving throw is allowed, or if the save is a success or failure.